o3 vs Grok 2.5
OpenAI o3 | SpaceXAI Grok 2.5 | |
|---|---|---|
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Apr 16 2025 | Aug 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 26% | — |
| Timeline | ||
| Release gap | o3 shipped 107 days before Grok 2.5 | |
Which is better: o3 or Grok 2.5?
o3 and Grok 2.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3 shipped 107 days before Grok 2.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — o3 and Grok 2.5 don't publish scores on any of the same benchmarks.
Frequently asked questions
o3 was released by OpenAI on Apr 16 2025.
Grok 2.5 was released by SpaceXAI on Aug 2025.